A281697 Number of 5Xn 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

0, 2348, 293814, 8944910, 269206287, 7098401706, 164629898128, 3629287949233, 76335741914492, 1549756410278579, 30628950794425136, 592221757039402089, 11246931571681164007, 210414733160308278802, 3886852267440320859871

Offset

1,2

Comments

Row 5 of A281693.

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

Some solutions for n=2
..0..1. .0..1. .0..1. .0..1. .0..1. .0..1. .0..1. .0..1. .0..1. .0..0
..1..1. .2..2. .2..2. .1..1. .1..2. .1..1. .0..0. .0..2. .0..2. .1..0
..0..0. .2..1. .0..1. .0..0. .2..0. .0..2. .2..1. .0..1. .1..0. .1..2
..0..1. .1..0. .1..2. .2..2. .0..2. .0..0. .2..0. .1..0. .0..1. .1..0
..0..2. .2..1. .1..1. .1..2. .2..1. .2..1. .0..0. .0..1. .2..0. .0..0

Crossrefs

Cf. A281693.

Sequence in context: A263556 A255099 A216989 * A045306 A351229 A264943

Adjacent sequences: A281694 A281695 A281696 * A281698 A281699 A281700

Keyword

nonn

Author

R. H. Hardin, Jan 27 2017

Status

approved